Clostridium difficile infection (CDI) Week 52 (Ending 30/12/2017)
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1 Clostridium difficile infection (CDI) Week 52 (Ending 30/12/2017) What is Clostridium difficile? Clostridium difficile is a Gram-positive anaerobic spore forming bacillus. It is ubiquitous in nature and can be found in the environment, as well as in the animal and human gastrointestinal tract. Its spore formation is critical to prolonged survival in the environment, its ability to spread and its resistance to many disinfectants and antiseptics including alcohols. It is an important nosocomial and community pathogen causing C.difficile associated diarrhoea, pseudomembranous colitis and rarely toxic megacolon. The organism is toxigenic if it expresses cytotoxin B (TcdB) +/- enterotoxin A (TcdA) which are coded for by the genes tcdb and tcda located on the Pathogenicity locus (PaLoc gene). The presence of these toxin genes does not always translate to toxin protein expression in vivo. C.difficile forms part of the intestinal microflora particularly of infants where it may be toxigenic or nontoxigenic and generally does not produce clinical disease. The presence of another toxin gene, Binary Toxin (cdta and cdtb) on the Transferase locus (CdtLoc) as well as deletions in tcdc (tcdc 117) are thought to contribute to increased virulence. This latter deletion affects the negative regulatory function leading to increased toxin production. These more virulent strains are currently uncommon in the Australian setting. Who to test not just a hospital infection Testing for C.difficile infection (CDI) should only be performed on patients with clinically significant diarrhoea. At risk groups include adults and children > 2 years of age who have been hospitalised >72 hours and develop diarrhoea with 3 loose stools over 24 hours (unless ileus is suspected) and not taking laxatives. Risk factors for infection include antibiotic ingestion (particularly clindamycin, 3rd and 4th generation cephalosporins, quinolones) or proton pump inhibitors (PPIs), older hospitalised individuals, those undergoing surgery, or who have Inflammatory Bowel Disease (IBD), and the immunocompromised. It is also recognised as a cause of community acquired diarrhoea in patients who have received prior antibiotics. Patients with community acquired CDI tend to be younger in age. Image 1: Gram stain: gram positive spore forming C.difficile organisms. Image 2: Spreading rhizoid colonies of C.difficile on selective agar. Image 3: Histopathology of the colon with pseudomembrane formation and inflammatory infiltrate. Non directed testing may lead to false positives where the presence of the detected organism may represent colonisation and not be causing disease. Asymptomatic carriage has been shown to occur in 50% of neonates, 1-3% of healthy adults and 20% of hospitalised patients. Repeat testing of an initial negative test is not recommended within 7-14 days as is a test of cure not indicated. How to diagnose CDI A number of algorithms are in use by microbiology laboratories. Currently two-step algorithms are recommended best practice. Historically SNP has performed C.difficile toxin testing by PCR since For a number of years all PCR positive samples also underwent Binary Toxin (BT) testing. This was ceased in June 2017 and replaced with a 2 step algorithm whereby all C.difficile PCR positive samples undergo EIA testing to detect the protein expression of enterotoxin A and cytotoxin B. Demonstration of toxin producing organisms provides some guidance as to whether a positive PCR result might represent carriage/colonisation as opposed to infection causing clinical disease. Image 4: Macroscopic appearance of the colon in CDI with pseudomembrane formation. A recent study has shown that PCR (+) but Toxin AB EIA (-) patients have very low rates of complications; most recover without treatment. Studies suggest that hospital inpatients that are PCR (+) Toxin AB EIA (-) should however be identified and undergo infection control precautions to prevent nosocomial transmission. Findings in this study however require further confirmation. PCR(+) Toxin AB(+) EIA results are more likely to manifest clinical disease rather than colonisation. Page: 1
2 Image 5: SNP current testing algorithm for Clostridium difficile infection Page: 2
3 This report contains a weekly update of Clostridium difficile PCR testing according the origin of the sample received. Figure 1: Hospital - % positivity Page 4. Figure 2: Residential Aged Care - % positivity Page 4. Figure 3: Community - % positivity Page 4. Figure 4: All samples combined - % positivity Page 4. Figure 5: PCR positive samples according to presence of detectable protein Toxin AB (EIA) - % positivity Page 4. Cumulative results of C.difficile PCR positivity by year (2007 YTD) according to origin of specimen Hospital - % positivity Page 5. Residential Aged Care - % positivity Page 5. Community - % positivity Page 5. All samples combined - % positivity Page 5. C.difficile PCR positive specimens - Presence of Binary Toxin (BT) for PCR positive patients to June 2017 Presence of protein Toxin AB (TOX AB) for PCR positive patients after June 2017 Hospital - % positivity Page 5. Residential Aged Care - % positivity Page 5. Community - % positivity Page 5. All samples combined - % positivity Page 5. C.difficile PCR testing and positivity by Age group, Origin of specimen and Year (YTD back to 2007) Pages 6-8 References Crobach MJT et al European Society of Clinical Microbiology and Infectious Diseases: update of the diagnostic guidance document for Clostridium difficile infection. Clin Micro and Infection 2016;22:S63-S81 Polage CL et al Overdiagnosis of Clostridium difficile infection in the Molecular Test era JAMA Int Med 2015:175: Longtin Y et al Effect of Detecting and Isolating Clostridium difficile Carriers at Hospital Admisssion on the Incidence of C.difficile Infections JAMA Int Med 2016;176: Page: 3
4 Page: 4
5 Results by year, age group, sector (hospitals, residential aged care, community) Note: Binary toxin (BT) PCR testing ceased in June 2017 and was replaced with protein Toxin AB where initial C.difficile PCR testing was positive. Page: 5
6 2018 C.difficile by age 2017 C.difficile by age 2016 C.difficile by age 2015 C.difficile by age Page: 6
7 2014 C.difficile by age 2013 C.difficile by age 2012 C.difficile by age 2011 C.difficile by age Page: 7
8 2010 C.difficile by age 2009 C.difficile by age 2008 C.difficile by Nicolaides Pathology (2017). If you wish to use this report or any data or graphs contained in the report you must seek the written permission of Sullivan Nicolaides Pathology. To request permission please send the following details and assurances to How the work will be used? Will the work be adapted? If it will be adapted or changed in any way, give specific details of the changes. Will it be included within other content, and if so what is the overall context, and what proportion of the overall work does the copied content represent. An assurance that the work will be properly attributed and will not be falsely attributed. Page: 8
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